expand 5x(2y-3).corect answer will be marked brainliest and rated excellent
Answers
Answered by
2
Step-by-step explanation:
:5(2y - 3) = 5(2y) - 5(3) = 10y - 15.
Answered by
0
We can look at the fourth row (we're counting from zero) of Pascal's triangel to obtain the coefficients of the expansion:
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
1
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
1
a
a
a
1
a
a
a
a
a
a
a
a
a
a
a
a
a
a
a
1
a
a
a
2
a
a
a
1
a
a
a
a
a
a
a
a
a
a
a
a
a
1
a
a
a
3
a
a
a
3
a
a
a
1
Knowing that the exponents of the left term decrease and the exponents of the right increase, we get:
(
5
x
+
2
y
)
3
=
(
5
x
)
3
+
3
(
5
x
)
2
(
2
y
)
+
3
(
5
x
)
(
2
y
)
2
+
(
2
y
)
3
=
125
x
3
+
3
⋅
25
x
2
⋅
2
y
+
3
⋅
5
x
⋅
4
y
2
+
8
y
3
=
125
x
3
+
150
x
2
y
+
60
x
y
2
+
8
y
3
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